Improvement in tunneling-machines



UNITED STATES PATENT OFFICE.

OHALKLY GRISOOM, JOHN P. GRISCOM, AND LEWIS GRISOOM, OF PORT OAR- BON,AND JOHN FRITZ, OF MAHANOY TOP, PENNSYLVANIA.

IMPROVEMENT IN TUNNELlNG-MACHINES.

Specification forming part of Letters Patent No. 118,010, dated August15, 1871.

To all whom it may concern:

Be it known that we, OHALKLEY GnrsooM, JOHN P. GnrscoM, and LEWISGnrscoM, of Port Carbon, and JOHN FRITZ, of William Penn Colliery,Shenandoah Valley, Mahanoy Top, Schuylkill county, in the State ofPennsylvania, have invented a new and useful Improvement inTunneling-Machines; and we do hereby declare the following to be a full,clear, and exact description thereof, which will enable others skilledin the art to which it appertains to make and use our invention,reference being had to the aecompanyin g drawing which forms a part ofthis speciiication, and in which- Figure 1, sheet 1, is a side view ofour improvement Fig. 2, sheet 1, a front view thereof 5 and Fig. 3,sheet 2, a plan or top view of the saine, the drill and working partsbeing omitted.

The same parts are denoted by the same letters in all the iigures.

A in the drawing represents a truck which is mounted on flanged wheelsso as to run on a railway. From the front of this truck a platform, B,is suspended a little above the surface ofthe rails. A hub, C, is boltedto the platform, and a mast or column, D, iis screwed into the hub orstepped into' the platform in any convenient way.

A The upper part of this column has a screw-thread eut in it to receivean extension screw, E, to which is feathered a nut, F, mortised, asshown at Gr G. A loose collar, H, rests on a shoulder Inear the top ofthe column and supports on its projecting arms the pulleys I I. Thecolumn is encircled by a sliding hub, K, from whose sides project thearms L L,xwhich form, with the hub, a yard or spar, adjustable atdifferent heights on the mast, as hereinafter explained. At each end ofthe spar are extension rods M M sliding within the spar, and adjusted bykeys or equivalent devices, and having screw-threads cut in their outerends to receive extension screws N N. On one arnr of the spar is a hub,O, which may be revolved around and slid along the spar, and adjusted inposition by any suitable means. To this hub is pivoted, as shown at P,the face-plate R, which carries a drill or boring-rod, S. The

gearing and even the engine by which the drill is actuated may, ifdesired, be mounted on the face-plate. The hub O, instead ofbeingconstructed in one piece, as shown, may also be made in two p arts,hinged together so as to form a hinged clamp. The spar formed by the hubK and arms L L is suspended from the mast by wire ropes passing over thepulleys I l on the swiveled collar H, and attached to the drums orwindlasses T T, which are mounted on the hub K and provided withratchets and pawls, by which the spar may be adjusted at differentheights.

The operation of these devices is as follows: The machine having beenrun on the railway to the face of therock to be drilled, blocking isplaced between the platforinB and the rails or bottom of the tunnel soas to give the foot of the column D a firm support, and the nut F isthen turned, by hand-spikes inserted into the mortises G Gr, until thepoint or top of the extension screw E bears with great force against thetop ofthe tunnel. Theextension rods M M are then slid out and adjustedto the width ofthe tunnel, and the screws N N turned, by any suitablemeans, until they also bear firmly against its sides, so that thestructure which sustains the drill-rod, is fastened solidly to the wallsof the tunnel at four points. The column, being mounted on the truck,may be readily adjusted at any desired distance from the face of therock; and, as the spar may be set at any height and at any angle withthe front of the truck, and the hub which carries the drill-rod may alsobe adj usted both around and in a direction parallel to the axis of thespar, while the face-plate, to which the drill-rod is more immediatelyattached, may be rotated and adjusted on the pivot P, it is evident thatthe drill may be made to operate at any height and in any direction. Thepump, tool-chests, Ste., may be conveniently carried on the truck andthe debris thrown upon it as the drillingprogresses. When enoughdrilling has been done for a blast the eX- tension screws are loosenedand the truck and machinery easily removed.

We have shown only one drill-rod and spar,

but it is evident that a greater number may, if

.suspended from the column.

desired, be mounted on the spar in the manner 2. The combination, Withthe collar H, pulleys described, and that a number of spars may be I I,and rope, or equivalent devices, of the drums T mounted on the hub K andoperating to raise What We claim as our invention, and desire to orlower the spar.

secure by Letters Patent of the United States, GHALKLEY GRISCOM. is-JOHN P. GRISCOM. 1. The combination, operating as described, of LEWISGRISCOM. the extensible column and the extensible spar JOHN FRYZ. whichsupports the boring-tool, and which is ad- Winesses: justable bothvertically upon the column and also THOs. A. BURTT,

about the axis thereof. WM. R. WRIGHT.

